package com.example.concurrency.atomic;

import com.example.concurrency.annotation.ThreadSafe;
import lombok.Getter;
import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;

/**
 * 可以使用 AtomicIntegerFieldUpdater 来控制修改时的原子性问题。
 *
 * @author 文希
 * @create 2019-05-11 13:24
 */
@Slf4j
@ThreadSafe
public class AtomicExample5 {

    private static AtomicIntegerFieldUpdater<AtomicExample5> updater =
            AtomicIntegerFieldUpdater.newUpdater(AtomicExample5.class, "count");

    @Getter
    public volatile int count = 100;


    public static void main(String[] args) {
        AtomicExample5 example5 = new AtomicExample5();
        if (updater.compareAndSet(example5, 100, add1())) {
            log.info("update success1-----> {}", example5.getCount());
        }

        if (updater.compareAndSet(example5, 100, add1())) {
            log.info("update success2----> {}", example5.getCount());
        } else {
            log.error("update failed----> {}", example5.getCount());
        }
    }

    private static int add1() {
        return 130;
    }

}
